English: Detailed map showing North America and Western Interior Seaway 75 million years ago, at the late Campanian (10 My before end of the Cretaceous).
Maps created by Ron Blakely, Colorado Plateau Geosystems, published and stated to be copyright T.A. Gates et al in their paper "Mountain Building Triggered Late Cretaceous North American Megaherbivore Dinosaur Radiation" (2012). Map may be used and modified for any purpose provided original author and source are attributed.
Ron Blakely, Colorado Plateau Geosystems is credited for the maps, in the paper, and Terry A. Gates et al are stated to be the copyright holders for the paper and its contents..
https://creativecommons.org/licenses/by/1.0CC BY 1.0 Creative Commons Attribution 1.0 truetrue
Paper states "Copyright: � 2012 Gates et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited."
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Detailed terrain map of North America 10 million years before the end of the Cretaceous Period, 75 million years ago